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---
layout: default
class: Header
title: Require-Capability ::= requirement ( ',' requirement )*
summary: Specifies that a bundle requires other bundles to provide a capability
---
Parameters requirements = new Parameters(annotationHeaders.getHeader(REQUIRE_CAPABILITY));
Parameters capabilities = new Parameters(annotationHeaders.getHeader(PROVIDE_CAPABILITY));
//
// Do any contracts contracts
//
contracts.addToRequirements(requirements);
//
// We want to add the minimum EE as a requirement
// based on the class version
//
if (!isTrue(getProperty(NOEE)) //
&& !ees.isEmpty() // no use otherwise
&& since(About._2_3) // we want people to not have to
// automatically add it
&& !requirements.containsKey(ExecutionEnvironmentNamespace.EXECUTION_ENVIRONMENT_NAMESPACE) // and
// it
// should
// not
// be
// there
// already
) {
JAVA highest = ees.last();
Attrs attrs = new Attrs();
String filter = doEEProfiles(highest);
attrs.put(Constants.FILTER_DIRECTIVE, filter);
//
// Java 1.8 introduced profiles.
// If -eeprofile= auto | (<profile>="...")+ is set then
// we add a
requirements.add(ExecutionEnvironmentNamespace.EXECUTION_ENVIRONMENT_NAMESPACE, attrs);
}
if (!requirements.isEmpty())
main.putValue(REQUIRE_CAPABILITY, requirements.toString());
/*
* Require-Capability header
*/
private void doRequireCapability(RequireCapability annotation) {
StringBuilder sb = new StringBuilder(annotation.ns());
if (annotation.filter() != null)
sb.append(";filter:='").append(annotation.filter()).append("'");
if (annotation.effective() != null)
sb.append(";effective:='").append(annotation.effective()).append("'");
if (annotation.resolution() != null)
sb.append(";resolution:='").append(annotation.resolution()).append("'");
if (annotation.value() != null)
sb.append(";").append(annotation.value());
add(Constants.REQUIRE_CAPABILITY, sb.toString());
}
package aQute.bnd.annotation.headers;
import java.lang.annotation.*;
/**
* The Bundle’s Require-Capability header
*
* {@link About}
*/
@Retention(RetentionPolicy.CLASS)
@Target({
ElementType.ANNOTATION_TYPE, ElementType.TYPE
})
public @interface RequireCapability {
String value() default "";
/**
* The capability namespace. For example: {@code osgi.contract}.
*/
String ns();
/**
* Specifies the time a Requirement is considered, either 'resolve'
* (default) or another name. The OSGi framework resolver only considers
* Requirements without an effective directive or effective:=resolve. Other
* Requirements can be considered by an external agent. Additional names for
* the effective directive should be registered with the OSGi Alliance. See
* <a href="https://www.osgi.org/developer/specifications/reference/">OSGi Reference
* Page</a>
*/
String effective() default "resolve";
/**
* A filter expression that is asserted on the Capabilities belonging to the
* given namespace. The matching of the filter against the Capability is
* done on one Capability at a time. A filter like {@code (&(a=1)(b=2))}
* matches only a Capability that specifies both attributes at the required
* value, not two capabilties that each specify one of the attributes
* correctly. A filter is optional, if no filter directive is specified the
* Requirement always matches.
*/
String filter();
/**
* A mandatory Requirement forbids the bundle to resolve when the
* Requirement is not satisfied; an optional Requirement allows a bundle to
* resolve even if the Requirement is not satisfied. No wirings are created
* when this Requirement cannot be resolved, this can result in Class Not
* Found Exceptions when the bundle attempts to use a package that was not
* resolved because it was optional.
*/
Resolution resolution() default Resolution.mandatory;
}
private void verifyRequirements() {
Parameters map = parseHeader(manifest.getMainAttributes().getValue(Constants.REQUIRE_CAPABILITY));
for (String key : map.keySet()) {
Attrs attrs = map.get(key);
verify(attrs, "filter:", FILTERPATTERN, false, "Requirement %s filter not correct", key);
String filter = attrs.get("filter:");
if (filter != null) {
String verify = new Filter(filter).verify();
if (verify != null)
error("Invalid filter syntax in requirement %s=%s. Reason %s", key, attrs, verify);
}
verify(attrs, "cardinality:", CARDINALITY_PATTERN, false, "Requirement %s cardinality not correct", key);
verify(attrs, "resolution:", RESOLUTION_PATTERN, false, "Requirement %s resolution not correct", key);
if (key.equals("osgi.extender")) {
// No requirements on extender
} else if (key.equals("osgi.serviceloader")) {
verify(attrs, "register:", PACKAGEPATTERN, false,
"Service Loader extender register: directive not a fully qualified Java name");
} else if (key.equals("osgi.contract")) {
} else if (key.equals("osgi.service")) {
} else if (key.equals("osgi.ee")) {
} else if (key.startsWith("osgi.wiring.") || key.startsWith("osgi.identity")) {
error("osgi.wiring.* namespaces must not be specified with generic requirements/capabilities");
}
verifyAttrs(attrs);
if (attrs.containsKey("mandatory:"))
error("mandatory: directive is intended for Capabilities, not Requirement %s", key);
if (attrs.containsKey("uses:"))
error("uses: directive is intended for Capabilities, not Requirement %s", key);
}
}
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